President:
Pres: Abraham Lincoln reelected over George B. McClellan
General
- Headlines: Civil War continues
- Communication: Successful trans-atlantic cable
- Law: Congress repeals fugitive slave laws
- Military: U.S. Grant made leader in North after Gen. Halleck
- Natives: Sand Creek Massacre begins Cheyenne War
- Politics: "In God We Trust" first appears on US coins
- Technology: Union warship sunk by torpedo by Confederate "submersible"
East
- District of Columbia: Knights of Pythias founded
- New York: Travers Stakes established at first racetrack in Saratoga
Marx's International Workingmen's Association founded with office collaborating with London main office
Confederate agents set Barnum Museum and Astor House afire in attempt to burn New York
Midwest
South
- General: Sherman's march to the sea
- Alabama: Admiral Farragut attacks Confederates in Mobile Bay with "Damn the torpedoes! Full speed ahead!"
- Georgia: Atlanta and Savannah destroyed by Sherman
- Mississippi: Tornado deaths of Civil war fighters
- Tennessee: General Sherman starts march from Chattanooga then through Georgia
- Virginia: Sherman marches to Richmond
West and Pacific
- California: First salmon cannery at Washington (city)
- Colorado: Massacre of Cheyenne and Arapahoe at Sand Creek - Whites kill 160 Cheyenne
- Montana Territory: Organized
- Nevada: Statehood - carved from Utah territory as 36th state
- Utah: Jack Slade (outlaw lynched in Virginia City) buried in Salt Lake
Box Elder renamed Brigham City